Apache :: Server Becomes Unresponsive With Wsgi Application
Nov 20, 2013
I have Apache 2.2 installed on Windows to host a web2py application using wsgi.
Apache crashed once stating it had run out of worker threads, so I inscreased ThreadsPerChild to 500. It has since crashed/become unresponsive without giving anything in the error log.
I set up mod_status, and am looking for understanding what I see when looking at server-status page.
It says 135 requests currently being processed, 365 idle worker. However I don't think there are 135 people connected.
Here's the request lines:
SrvPIDAccMSSReqConnChildSlotClientVHostRequest
0-1253840/0/0W138495448300.00.000.00
... the line above is repeated identically 125 times
0-1253840/32/32W000.00.460.46127.0.0.1dalgety-svr8.havelock.intGET /server-status HTTP/1.1
0-1253840/0/0W52400.00.000.00192.168.202.109dalgety-svr8.havelock.intGET /HubForms/ProjectFolderIndexing/index HTTP/1.1
[Code] ....
Question:
1) What are those 125 requests, and why are they not exiting. Are they anything to worry about? why is there no Client/VHost/Request? Could they be from the python process? Could they be what's causing the issue?
2) The Acc entry 0/121/121 on /HubForms/capacity_requests/index - is this representative of an issue?
3) When I restart Apache, it typically says "Terminating 375 threads that failed to exit" but that number doesn't match up with anything. Are these the idle threads?
Also I'm not sure what "restart" actually means, i.e. what stops and what stays (i.e. why am I on generation 0-12?).
4) Is any of this anything to do with why Apache becomes unresponsive, or should I be looking elsewhere?
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Apr 11, 2008
Many a times websites hosted on my Red Hat Linux server would not open even though Apache and everthing else is up and running. When i hit reload on browser 4-5 times the website would load or i have to restart Apache and everything starts working normally.
Today when this problem resurfaced i did not restart Apache and looked for in apache logs and saw this strange entry in apache Error Log;
[client my.ip.xx.xx] script '/my/website/httproot/mdqt.php' not found or unable to stat
The above was in apache Error Log, above is my ip address, and i never requested a file named mdqt.php, in fact no file by the name mdqt.php even exist on my entire server.
I then looked for mdqt.php in error logs and saw several requests made for this file and from various IP addresses.
i understand this is what causes my http to die.
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What is a good approach to troubleshooting these?
Here is what I do, if I'm off base, I'm here to learn and will read
find / -name "core.*" -ls | egrep core.[0-9]
**try and find software failure
df -h
**validate disk usage
** check /var/log/messages /var/log/dmesg
If I can't find anything obvious in those places, I start digging through the access_logs and error_log to try and find a giant influx of requests that could have hit the server too quickly to process thus filling the memory up.
In this case, I adjust the rlimits.
*shrug* This is not fixing the issue on a few servers and I'm curious how other people approach this problem? Could this be hardware?
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I'm puzzled as to what the problem could possibly be or how I can fix it--any ideas? My server's running Fedora 6 / GoDaddy control panel.
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Hosting Settings
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Oct 12, 2009
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While we have exploratory emails out to DreamHost and a few others, I was hoping someone here would know a way to contact Burton---I just hate not knowing!
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This is my first post here and this sub-forum seems to be adequate for my question. If it is not, I apologize in advance.
I want to create a web application for an upcoming project of mine that has the potential to attract a large number of people. So the web application needs to be fast and secure at the same time.
I used PHP for minor projects for some time now, and although it is really efficient for quick web development, it _appears_ to me like a house of cards waiting to collapse. If you know how to use it properly, it can be acceptable, but there are still numerous security exploits in PHP itself that have surfaced over the last decade. Additionally, it tends to be quite slow and has a lot of bugs that aren't really security related, but can make your life hard. I've run test scripts (that I optimized for web deployment) on my own computer, and even on my own computer which is way faster (in terms of CPU speed, number of cores, RAM, and so on) than most servers, it runs slow--without any database access! And I honestly don't buy the "your server will spend most time in your database anyway, so don't worry about that" statements. I've tested it with databases that have millions of rows in them, and coded a test script that accesses the table and then calculates stuff from that and outputs it. If I comment out the database access the time needed to execute the script is only marginally reduced. I observed the same in my other projects. I also used Python and the problem seems to be the same.
Now, before the PHP/Python fanboy crowd yells at me: "Google uses Python and Wikipedia uses PHP, too". Yes, I know. But they have a lot of money to throw at the problem and can easily add new hardware if needed (Wikipedia alone has collected over 6m USD in the last year from donations). And a Wikipedia staff member I talked to some while ago told me that it's a miracle that Wikipedia is still running given that it is written in PHP with all its security problems (not my words).
So I thought: why not use a compiled language?
The obvious advantages would be that it is faster, and that I can leave out all the junk that is not needed in my case, thereby decreasing the chance of badly written code running in memory.
I have coded in C and C++ for a long time, including security-critical applications. So I absolutely know how hard it can be to write really secure applications, but I think it is also fair to say that I know how to minimize the risk of buffer overflows, validate user input properly, and so on. I often force myself to review my code some time later, in order to spot coding mistakes that you just won't see the first time. Additionally, I've created a neat string library around the standard library that makes string manipulation as easy as in PHP or Python.
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